plugin-Chapter 6 Students

plugin-Chapter 6 Students - Experiments in the Real World...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
CHAPTER 6 Experiments in the Real World
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
THOUGHT QUESTION 1 Suppose you are interested in determining if drinking a glass of red wine each day helps prevent heartburn. You recruit 40 adults age 50 and older to participate in an experiment. You want half of them to drink a glass of red wine each day and the other half to not do so. You ask them which they would prefer, and 20 say they would like to drink the red wine and the other 20 say they would not. You ask each of them to record how many cases of heartburn they have in the next six months. At the end of that time period, you compare the results reported from the two groups. Give three reasons why this is not a good experiment.
Background image of page 2
EQUAL TREATMENT FOR ALL SUBJECTS The underlying assumption of randomized comparative experiments is that all subjects are handled equally in every respect except with regard to the treatments being compared. If the subjects are not handled equally in other respects, there might be bias. However, handling subjects exactly the same way is difficult, if not impossible.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Patients who know they are receiving a placebo may feel worse just because they know that they are not being treated. A doctor who knows a patient is receiving a placebo may treat that patient differently. A double-blind experiment is one in which neither the subject nor the people who work with them know which treatment each subject is receiving. The standard for experiments is a “randomized,
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 08/05/2011 for the course STA 200 taught by Professor Wierdhobbitguy during the Summer '08 term at Kentucky.

Page1 / 17

plugin-Chapter 6 Students - Experiments in the Real World...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online